Pulse Detector - HBM Genesis GEN5i User Manual

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Figure 10.9: Slope trigger
A Trigger
B Original signal
C Differentiated signal
With the slope triggering it is possible to trigger on a specific change in slope
of the signal, for example on a spike on a repetitive signal: if the slope (or
frequency) of the signal exceeds the specified level, a trigger will be generated.
10.4.2

Pulse detector

The pulse detector can be used together with the basic (slope) trigger level
detector. It can be used for two opposite purposes:
Detect trigger conditions smaller than a set period of time: pulse detect
l
Detect trigger conditions larger than a set period of time: pulse reject
l
All operations of the trigger detector are the result of crossing the level of a
comparator. If, after crossing, the condition of the comparator is not stable for
at least a specified period of time, the crossing is not a valid trigger condition,
i.e. it is a small pulse (or noise) that can be omitted, and no trigger is generated.
If, after crossing, the condition of the comparator is stable for a specified period
of time, the crossing is a valid trigger condition, i.e. it is a small pulse that must
be recorded, and a trigger is generated.
The pulse detector operates on samples (2 to 65535). In the Perception
software this is translated into time. At 1 MS/s sample rate this results in a
maximum of 65.535 millisecond.
GEN5i
I2679-4.0 en